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Short-Term Borrowings - Summary of Federal Funds Purchased and Other Short-term Borrowings (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Letters Of Credit [Line Items]
Outstanding balance at year end		$ 0us-gaap_ShortTermBorrowings
Federal Funds Purchased [Member]
Letters Of Credit [Line Items]
Maximum indebtedness during the year		10,000,000us-gaap_ShorttermDebtMaximumAmountOutstandingDuringPeriod / us-gaap_ShortTermDebtTypeAxis = us-gaap_FederalFundsPurchasedMember
Average balance during the year	41,000us-gaap_ShorttermDebtAverageOutstandingAmount / us-gaap_ShortTermDebtTypeAxis = us-gaap_FederalFundsPurchasedMember	28,000us-gaap_ShorttermDebtAverageOutstandingAmount / us-gaap_ShortTermDebtTypeAxis = us-gaap_FederalFundsPurchasedMember
Average rate paid during the year	0.54%us-gaap_ShortTermDebtWeightedAverageInterestRate / us-gaap_ShortTermDebtTypeAxis = us-gaap_FederalFundsPurchasedMember	0.53%us-gaap_ShortTermDebtWeightedAverageInterestRate / us-gaap_ShortTermDebtTypeAxis = us-gaap_FederalFundsPurchasedMember
Federal Home Loan Bank Advances [Member]
Letters Of Credit [Line Items]
Outstanding balance at year end	42,700,000us-gaap_ShortTermBorrowings / us-gaap_ShortTermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember
Maximum indebtedness during the year	42,700,000us-gaap_ShorttermDebtMaximumAmountOutstandingDuringPeriod / us-gaap_ShortTermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember
Average balance during the year	$ 1,951,000us-gaap_ShorttermDebtAverageOutstandingAmount / us-gaap_ShortTermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember
Average rate paid during the year	0.19%us-gaap_ShortTermDebtWeightedAverageInterestRate / us-gaap_ShortTermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember
Interest rate on year end balance	0.14%us-gaap_ShortTermDebtPercentageBearingVariableInterestRate / us-gaap_ShortTermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember

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- Definition

Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19

-Subparagraph a

-Article 5



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(a))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.13)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.(a),16(a)(1))

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910



Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Subparagraph a(1)

-Article 7



Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 13

-Subparagraph 2, 3

-Article 9

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- Definition

For the form of debt having an initial term of less than one year or less than the normal operating cycle, if longer, average borrowings during the period.

+ References

No definition available.

+ Details

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- Definition

For the form of debt having an initial term of less than one year or less than the normal operating cycle, if longer, the maximum amount borrowed at any time during the period.

+ References

No definition available.

+ Details

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- Definition

The portion of the carrying amount of short-term borrowings outstanding as of the balance sheet date, which accrues interest at a rate subject to change from time to time.

+ References

No definition available.

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- Definition

Weighted average interest rate of short-term debt outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19

-Subparagraph b

-Article 5

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